Spring-controlled valve



Nov. 2, 1926. 1,605,399-

G. FORNACA SPRING coNTRoLLED VALVE Filed SGDL. 19,25

Patented Nov. 2, 1926.

UNITED STATES GUIDO FORNACA, OF TURIN, ITALY.

SPRING-CONTROLLED -VALVE.

Application filed September 2, 1925, Serial No: 54,041, and in Italy September 8, 1924.-

The object of this invention is to provide an improved arrangement of spring-controlled valve which is primarily intended foi internal combustion engines but may also be used with other apparatus. By a spring controlled valve I mean a valve equipped with spring means wherein energy is stored for returning the valve when this is moved in one direction.

Generally the valves of internal combus tion engines are maintained on their seatings by helical springs one for each valve arranged coaxial with the valve stem. With this arrangement the fracture of the single spring renders the valve inoperative and necessitates immediate replacement.

According to the present invention this inconvenience is eliminated by substituting for the single spring a plurality of springs grouped around the .valve stem and maintained in position by a disc secured to said stem.'

By this arrangement the reaction is distributed uniformly over a group of springs, and it is much more diflicult for fractures to occur.v Moreover, if one of the springs does break the valve can continue to operate Without disadvantage, and the broken spring can be replaced at any convenient time and place. rlhe arrangement also ensures a bet- ;er cooling of the springs, their normal working temperature being obviously lower that that of the ordinary arrangement in which there is a single spring coaxial with the valve stein.

A feature of the invention consists in the manner of mounting the group of springs so that, while they are perfectly guided, they can be easily and quickly removed and. replaced.

An embodin'lent of the invention suitable for internal combustion engines is illustrated, by Way of example, on the accompanying drawing.

Fig. 1 is a vertical section, and F ig. 2 a cross section (in the plane C-D of Fig. l).

In the drawing, the reference numeral l indicates the stein of a mushroom or poppet valve 2, furnished with a large disc'3. An annular cup 9 rests on a fixed shoulder 6 of the engine, and in the bore of the cup is inserted a guide 7 for the stem l of the valve 2. This guide is provided With a flange 8 which engages the cup and is itself engaged by a similar flange on a guide box l'for the group of springs 4. The lower part of the guide box fits into the cup 9 and has a flange ll'serving as a support for the springs 4 which pass through openings (see Fig. 2) in the upper part 14 of the box and bear against the disc 3 secured to the valve stem.

The disc 3 has a conical bore-Which is engaged by a divided cone 13 on the valve stem to prevent the disc from moving upward on the valve stem. 'Io prevent said disc from' being displaced ydownward with respect to the valve stem, a cap 11, and a suitable ring 12 are provided. By this arrangement the disc 3 may be easily removed and replaced.

What I claim is:

l. In a spring controlled valve, a member having a valve seat therein, a sleeve mounted in said member, a stem on the valve movable in the sleeve, a cup mounted on the sleeve engaged by a flange on the latter, a guide box mounted on the sleeve engaging said flange, a series of springs grouped around the valve stem and located in pockets in the guide box, and a disc on the valve stem forming an abutment for the springs whereby the latter are maintained under tension..to normally seat the valve.

2. In a spring controlled valve, a member having a valve seat therein, a sleeve mounted in said member, a stem on the valve movable in the sleeve, a cup mounted on the sleeve in engagement with a flange on the latter, a guide box mounted on the sleeve engaging said flange, a series of 'springs grouped around the valve stem and located in pockets in the guide box, a disc on the valve stem having a conical bore, a divided conical cap secured to the stem and seated in said bore, said disc forming an abutment for the springs whereby the latter are maintained under tension to normally seat they valve.

In testimony that I claim the foregoing as my invention, I have si ed my name.

GUIDO FORNACA. 

